Mechanism for pipe-cutting.



C. DIESA MECHANISIVI FOR PIPE CUTTING,

APPLICATION FILED DEC. I6, I9IZ.

LI. Q5., Patented Nov,I M, 1916.

2 SHtkIS-SHEEI I.

I l. .I .l llllllfllhlllllllll /l r-v H M I il C. A. DIES.

MECHANISIVI FOR PIPE CUTTING.

APPLICATION FILED DEC. I6,I9I2.`

Patented Nw. 14, 1916.

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2 SHEEIS-SHEET 2.

- iii 14291921? FFIE.

CHARLES ALBERT DIES, F CHICAGO, ILLINOIS, ASSIGNOR TO MARK MANUFACTURING COMPANY,.OF CHICAGO, ILLINOIS, A COPARTNERSHIP COMPRISED OF CLAYTON MARK, ANSON MARK, ANI) CYRUS MARK.

MECHANISM FOR PIPE-CUTTING.

T 0 all whom t may concern Be it known that I, CHARLES A. Dies, -a citizen of the United States, residing at Chi* cago, Cook county, Illinois, have invented a new and Improved Mechanism for Pipe-'Cutting, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is a side elevation of my cutting mechanism partly in section; Fig. 2 is an end elevation thereof Fig. 3 is a section on lines III-III of Fig. 1; Fig. 4 shows in elevation a modified form of my device and Fig. 5 is a section on lines V-V of Fig. 4.

My inventionrelates to mechanismv for cutting pipe and is especially designed to shear the pipe without the use of internal supporting means.

Referring to the drawings, 2 is the base suitably apertured" at 3 for the reciprocating holder 4 and the saw 5 which is secured in the holder '4 by any suitable means such as the rivets 6. The holder 4 is carried and actuated by the shank 7, which is adapted to be mounted in any suitable manner and to be reciprocated by any suitable means.

The pipe gripping means is preferably comprised of a Xed jaw 8 which is bolted to the base 2 and of a movable jaw 9, and these jaws are suitably slotted to permit the passage of the holder 4 and saw 5 there through.

10 is a pipe in position to be operated on.

The movable jaw 9A is adapted to be moved away from the jaw 8 by the toggle 11. The toggle 11 is pivoted at 12 to the jaw 9 and to the base at 13, and at 14 to the bar 15. The bar 15 has a spring 16 positioned thereon which is held in tension by the collar 17 which is fastened to the bar 15, and by the arm 18 which is mounted on the base 2.

19 is a strap pivoted at its ends to the base 2 and to the bar 15. The strap 19 may be actuated by any suitable means, such as the foot treadle 20, and by it and through the bar 15 and toggle 11, the jaw 9 is retracted to free the pipe after its shearing or cutting operation and to permit the insertion of another pipe.

It is to be noted that the saw teeth A and C which are near the ends of the saw are arranged to do a greater amount of work than the teeth B toward the middle part of the saw, and this is because there is a much Specification of Letters Patent. i Pgmfentgd NGV. 141. 1916. Application led December 16, 1912. Serial No. 736,898.

greater thickness of metal to be sheared through at any given point in the parts marked a and c than lthere is in the parts marked The operation of my device is as follows: I insert by any suitable means the pipe to be sheared between the jaws 8 and 9, the jaw `9 being retracted to permit such insertinri. and by releasing the foot treadle 20 the jaw 9-is f orced against the pipe, by means of the tension on the spring 16, so as to hold it in position to be operated upon. I then actuate the shaft 7 and the saw is moved downward to shear the pipe. The large teethA shear through the thick part of the pipe marked a, and small teeth B through the thin parts of the pipe marked b and the large teeth C through the part of the pipe marked c, and the arrangement of the teeth is such that the pipe will be cut through cleanly without leaving any bur or bead on either the interior or the exterior of the cut sections of the pipe.

In Figs. 4 and 5 I show a modified form of my cutting mechanism in which the saw 5 is circular in form, and is mounted in the rotary frame or holder 4 which is driven by the gear wheel 21 and is supported by the idlers 22 carried by the base 2. The saw 5 travels in the direction of the arrow and the teeth A cut through the thick section a', the teeth B through the thin sections b, and the teeth C through thick sections o in substantially the same manner as described above. In this modification vthe pipe gripping means are comprised of the iXed jaws 8 82, on each side of the saw 5 and of the movable jaws 9 92 also located on opposite sides of the saw 5. The jaws 9 and 92 are actuated through the jointed lever 112, the shaft 23 and the toggle 11. The lever 112 and the toggle 11 are secured to the shaft 23 which is rotatably mounted on the base 2. The remainder of the operating mechanism is identical with that shown in Figs. l, 2 and 3. I have found that when I shear pipe with the device which I have described and shown herein, that no internal supporting mandrel, or other like means, is necessary, and that my improved saw leaves the edges of the pipe clean cut without any bead or rough edges either internally or externally.

Many changes may be made in the construction land operation of the mechanism i thereon, one of said groups 1 greatest described and shown herein Without departing from my invention.

1What I claim is:

1. A pipe cutting mechanism having gripping means for the pipe, a saw blade having differentially f arranged groups 'of teeth being adapted to shear lthrough the metal of the pipe in its i dimension in cross section, another of said groups being adapted to shear through the metal of the pipe in its least dimension in cross section and athird of said groups being adapted to shear through the remaining metal in a dimension which is at least as great as that of the metal sheared byv the first group of teeth, the said sav's7 blade comprising means Jfor cutting the pipe in onel continuous stroke.

2. In a pipe Cutting mechanism means for supporting the pipe externally and a saw having differentially arranged sets of teeth, the Coarser v teeth being adapted to cut through the metal of the pipe at its greatest seotioiai, and the teeth of the smaller sets be- 3. In a pipe cutting mechanism, a base, a

`saw mounted on said base and adapted for cutting through a pipe, said. saw vbeing stroke by a plurality of series of teeth, each series being adapted to remove a predetermined amount of metal, and means for eX- ternally supporting an internally unsupported pipe on said base, comprising pipegripping jaws, to said base and the other ofsaid jaws being adapted to be moved toward and away from said pipe for releasing and gripping the same. p

CHARLES-ALBERT DIES.

Witnesses:

'CLARENCE MARK,

JOHN K. SAvILIlE.

one of said jaws being iXed vadapted to out throughl a vpipe at a'single` 

